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I have heard that these stamps were used as a form of 'receipt' on invoices and possibly even used on cheques (checks) but I cannot confirm this.
They bear a passing resemblance to the French stamps that performed those functions, so it is plausible. As for era, the dates would imply late twenties, early thirties, which matches their appearance. How long they were in use before, or after, I have no idea...
Just biding time until someone comes along who knows what these are.....
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